chore(docs): Remove -icon string from icon png's (#2040)

* rename icons (remove `-icon`)

* Remove (`-icon`) from chart.yaml

* Add 2 icons

* slight format change

* remove -icon

charts/stable/wikijs/Chart.yaml

@@ -8,7 +8,7 @@ keywords:
 - wiki
 - wikijs
 home: https://github.com/truecharts/apps/tree/master/charts/stable/wikijs
-icon: https://truecharts.org/_static/img/appicons/wikijs-icon.png
+icon: https://truecharts.org/_static/img/appicons/wikijs.png
 sources:
 - https://hub.docker.com/r/linuxserver/wikijs/
 - https://github.com/Requarks/wiki